Mathilde's Vegetable Soup

• 5 vegetable bouillion (cubes)
• 2 stalks celery
• 2 cans of tomatoes (diced)
• 1 onion up (cut)
• 1 potato
• 1/2 green pepper
• 475 ml tomato juice
• 160 gr mushrooms
• 8 gr salt
• 1 gr pepper